of rock together.The cementing agent will oftendetermine the color of the rock.

The processes of compression andcementation often work together to forma sedimentary rock.

Rock Formation by ChemicalProcesses

Some sediment is created through chemical weathering when soluble mineralsare dissolved by water to form a solution. Sea water is a common example ofthis type of solution.

Often, evaporation of water causes the mineralprecipitation

that results in theformation of a chemically formed sedimentary rock. When water evaporatesthe soluble materials are left behind as chemical deposits. The rocks that formfrom this process are calledevaporites.

If an evaporite is made of only one type of mineral it is referred to as amonomineralic rock.